Trussed structure



a. H; DAWSON ET AL TRUSSED STRUCTURE May 8, 1928. 1,668,673

Original Filed NOV. 26- 1925 4,, 2 9 gnvmlfo'm George [Yd/es DQ078012 [fzmxZ/za/ Held Freasa VII assembled. Moreover in such an assembled Patented May 8, 1928.

UNITED STATES PATENT OFFICE.

GEORGE H IVES DAWSON, OF IBOSTON, MASSACHUSETTS, AND HURXTHAL FIELD FREASE, OF CANTON, OHIO.

TRUSSED STRUCTURE.

Original application filed November 26, 1923, Serial No. 676,897. Divided and this application filed February 4, 1925.

The invention relates to trussed structures having spaced chord members and connecting web members joined together; and this application is a division of our prior application for patent for trussed structures, filed November 26, 1923, Serial No. 676,897, which has matured into Patent No. 1,526,463.

Ordinarily the chord and web members of trussed structure are separate pieces which must be made to size and assembled to form the completed structure. In the manufacture of even a simple trussed girder of sub-- stantial length, while the equivalent of a large number of chord members is attained by the use of two. or more strips of the total length of the girder, yet there are still a large number of separate web members each of which must be made and punched to size and each of which must be properly assembled and'fastened usually by means of rivets to the contii'iuous equivalents of a large number of chord members. In the manufacture of such a girder the number of separate members each of which must be made to size and assembled often runs to several hundred. Due to the fact that most of these members must be fastened at each end to the co-operating members in the structure or the equivalents thereof, the number of chances for manufacturing and assembling errors, for two ended members, is double the number of members or equivalents to be trussed structure unequal strains and stresses are often set up in individual. members due to the fact that it has been found to be a practical impossibility accuri itely to space and secure the fastening means which tie the truss members together at the joints.

The objects of the present invention are to economize the manufacture of trussed structures and to overcome unequal strains and stresses due to erection inaccuracies, by reducing the number of parts to be made and assembled; and these objects are attained by the use of- Trussed elements formed from continuous strips and including spaced rows of chord members and connecting web members, there being junction angles between the chord and web members, and loops at the junction angles, and means such as lock rods fastening the loops and thereby the chord and web members to each other at the junction angles.

Serial No. 6,706.

Moreover common transverse lock rods may be used to fasten a plurality of side by side t-russed elements, thereby providing lateral strength, rigidity. and stability in the trussed structural combination.

The invention is illustrated in the accompanying drawing forming part hereof, in which Figure 1 is an isometric view of one form of the improved trussed structural combimay be of any desired substance; for most practical purposes a continuous metallic material adapts easily to the necessary forming operations, and to assembly by the disclosed or other means.

.Moreover, it is to be understood, that while the material illustrated is solid, the structures of the invention may be made of perforated material, of expanded material, or of material having any other desired conformation.

Similar numerals ret'cr to similar parts throughout the drawing.

The trussed structure 1 includes a plu rality of trussed elements 2 formed from continuous strip material of any desired type, but indicated in the drawing for the sake of convenience as being sheet material.

The elements 2 each include spaced chord members 3 and connectingweb n'leinbers 4;, and there being junction angles or apexcs 5 having lapped loops (5 between the chord and web members.

The trusses are fastened together by the lock and transverse reinforcing rods 7 which pass through the lapped loops as shown.

The rods 7 may, as shown, fasten and reinforce a plurality of trussed elements having apex loops to form a trussed panel structure having strength, rigidity and sta bility in all directions.

An individualtrussed element'havin apex loops and loop fastening or locking means may be used Wherever desired.

The formation and joining of the loops '6 at. the junction angles are best illustrated in Figs. Qua-us, in'ivh'ich a trus ed element 2 is formed from a continuous rial oi any desired type and includes spaced chord members 3 and connecting web members i and junction angles or apenes 5 having lapped loops (3 between the chord and wee members,

The trussed element is fastened together by lock rods 7 which pass through the lapped loops as shown. The loops (3 are formed at the junction angles by providing longitudinal slits "8 in the continuous material at the junction angles and forming angle abutments 9 besideangle llCjEiCtlOnf'l 10 in each unction angle, the abutments 9 in one junction angle registering with the projections 10 of its opposed angle, so that the projections intertit with each other and form loops through which the loci; rods may be inserted to fasten the structure together.

It is obvious that it the abutments 9 be entirely cut away, loops will. be formed by the interlitting projections 10 through which the lock rods may be inserted for fastening the structure, but it is-pre'terr'ed to retain the abutments 9 to take full advantage of all thematerial in the strip.

We claim:

1. A trussed element formed from a continuous strip and including spaced rows of chord members and connecting \veb memri p of ma tehers, there bein junction angles between the chord and We members, and loops at the junction angles. j

2. trussed structure including a plurality of truss'ed elements, each element includ ing spaced rows of chord members and connecting web members and having junction angles between-the chord and web members and loops iatkthe junction angles, and common means passing through and securing the loops and the chord and web members of the elements to each other at the junction angles.

3. A trussed element formed from a continuous strip and including spacedrows 0t chord members and connecting Web members, junction angles between the chord and web members, loops at the junction angles, andmeans passing through and securing the loops to each other.

l. A trussed element formed from a continuous strip and including spaced rows of chord lneinbersandconnecting Web members, junction angles between the chord and web members and inter-fitting an'gie projections in the junction angles.

5. A trussed element formed from a continuous strip and including spaced rows of chord members and connecting Web members, junction angles between the chord and web members, and inter-fitting angle projections in the junction angles, and means passing through and securing the angle projections to each other.

in testimony that we claim the above we have hereunto subscribed our names.

GEORGE 'H-IVES DAWVSON. HURXTHAL FIELD FREASE. 

